Open Access. Powered by Scholars. Published by Universities.^{®}
Physical Sciences and Mathematics Commons^{™}
Open Access. Powered by Scholars. Published by Universities.^{®}
 Discipline

 Physics (1830)
 Elementary Particles and Fields and String Theory (341)
 Nuclear (324)
 Quantum Physics (240)
 Engineering Physics (208)

 Astrophysics and Astronomy (142)
 Plasma and Beam Physics (96)
 Atomic, Molecular and Optical Physics (69)
 Engineering (53)
 Optics (40)
 Other Physics (36)
 Education (33)
 Oceanography and Atmospheric Sciences and Meteorology (25)
 Cosmology, Relativity, and Gravity (24)
 Chemistry (23)
 Environmental Sciences (22)
 Science and Mathematics Education (20)
 Biological and Chemical Physics (18)
 Materials Science and Engineering (18)
 Atmospheric Sciences (17)
 Oil, Gas, and Energy (16)
 Condensed Matter Physics (15)
 Environmental Indicators and Impact Assessment (15)
 Instrumentation (15)
 Natural Resources and Conservation (15)
 Environmental Monitoring (13)
 Mechanical Engineering (13)
 Natural Resource Economics (12)
 Natural Resources Management and Policy (12)
 Institution

 Old Dominion University (822)
 Wright State University (341)
 Cleveland State University (252)
 University of Richmond (128)
 University of New Orleans (67)

 University of Nebraska at Omaha (59)
 University of Massachusetts Boston (38)
 Ateneo de Manila University (36)
 University of Dayton (26)
 College of Saint Benedict and Saint John's University (24)
 University of North Dakota (20)
 University of South Florida (15)
 Merrimack College (13)
 Bridgewater State University (11)
 California State University, San Bernardino (9)
 Sacred Heart University (9)
 Fort Hays State University (5)
 University of Rhode Island (5)
 Howard University (3)
 University of New Haven (3)
 Keyword

 Physics (84)
 Cavity (61)
 Scattering (60)
 Quantum chromodynamics (53)
 Electron (40)

 Deep inelastic scattering (29)
 SRF (29)
 Lattice QCD (28)
 CLAS (26)
 Electroproduction (26)
 Niobium (25)
 Lepton induced nuclear reactions (24)
 Mesons (23)
 Photoproduction (23)
 Simulation (23)
 Form factors (22)
 HOM (22)
 Nucleon (21)
 QCD (21)
 Proton (20)
 Model (19)
 Parton distributions (19)
 Polarization (19)
 Protons (18)
 Quarks (18)
 Luminosity (17)
 Experiment (15)
 Gun (15)
 Particle interactions (15)
 Photonuclear reactions (15)
Articles 1  30 of 1886
FullText Articles in Physical Sciences and Mathematics
TwoPhoton Absorption And Fluorescence Of Cadmium Sulfide, Jacob Goranson, Gregory J. Taft
TwoPhoton Absorption And Fluorescence Of Cadmium Sulfide, Jacob Goranson, Gregory J. Taft
Physics Faculty Publications
The twophoton absorption and fluorescence of bulk cadmium sulfide were studied using 50fs, 800nm pulses from an unamplified Ti:sapphire laser. The fluorescence spectrum was measured to have a main peak at 522 nm, and the power of the fluorescence was shown to vary quadratically with the 800nm beam power. This supports the theory that the fluorescence is excited by twophoton absorption and confirms previous work done with longer duration, higher energy excitation pulses. Pumpprobe measurements provided additional confirmation of the twophoton absorption. Measured spectral broadening of the wings of the laser spectrum also was observed, which likely is due to …
Counting Linearly Polarized Gluons With Lattice Qcd, Shuai Zhao
Counting Linearly Polarized Gluons With Lattice Qcd, Shuai Zhao
Physics Faculty Publications
We outline an approach to calculate the transversemomentumdependent distribution of linearly polarized gluons inside an unpolarized hadron on the lattice with the help of large momentum effective theory. To achieve this purpose, we propose calculating a Euclidean version of the degree of polarization for a fastmoving hadron on the lattice, which is ultraviolet finite, and no soft function subtraction is needed. It indicates a practical way to explore the distribution of the linearly polarized gluons in a proton and the linearly polarized gluon effects in hadron collisions on the lattice.
Accelerating Markov Chain Monte Carlo Sampling With Diffusion Models, N. T. HuntSmith, W. Melnitchouk, F. Ringer, N. Sato, A. W. Thomas, M. J. White
Accelerating Markov Chain Monte Carlo Sampling With Diffusion Models, N. T. HuntSmith, W. Melnitchouk, F. Ringer, N. Sato, A. W. Thomas, M. J. White
Physics Faculty Publications
Global fits of physics models require efficient methods for exploring highdimensional and/or multimodal posterior functions. We introduce a novel method for accelerating Markov Chain Monte Carlo (MCMC) sampling by pairing a MetropolisHastings algorithm with a diffusion model that can draw global samples with the aim of approximating the posterior. We briefly review diffusion models in the context of image synthesis before providing a streamlined diffusion model tailored towards lowdimensional data arrays. We then present our adapted MetropolisHastings algorithm which combines local proposals with global proposals taken from a diffusion model that is regularly trained on the samples produced during the …
Formulation Of CausalityPreserving Quantum Time Of Arrival Theory, Denny Lane B. Sombillo, Neris I. Sombillo
Formulation Of CausalityPreserving Quantum Time Of Arrival Theory, Denny Lane B. Sombillo, Neris I. Sombillo
Physics Faculty Publications
We revisit the quantum correction to the classical time of arrival to address the unphysical instantaneous arrival in the limit of zero initial momentum. In this study, we show that the vanishing of arrival time is due to the contamination of the causalityviolating component of the initial wave packet. Motivated by this observation, we propose to update the temporal collapse mechanism in Galapon (2009) [18] to incorporate the removal of causalityviolating spectra of the arrival time operator. We found that the quantum correction to the classical arrival time is still observed. Thus, our analysis validates that the correction is an …
NonSinglet Quark Helicity Pdfs Of The Nucleon From PseudoDistributions, Robert Edwards, Colin Egerer, Joseph Karpie, Nikhil Karthik, Christopher Monahan, Wayne Morris, Kostas Orginos, Anatoly Radyushkin, David Richards, Eloy Romero, Raza Sabbir Sufian, Savvas Zafeiropoulos, On Behalf Of The Hadstruc Collaboration
NonSinglet Quark Helicity Pdfs Of The Nucleon From PseudoDistributions, Robert Edwards, Colin Egerer, Joseph Karpie, Nikhil Karthik, Christopher Monahan, Wayne Morris, Kostas Orginos, Anatoly Radyushkin, David Richards, Eloy Romero, Raza Sabbir Sufian, Savvas Zafeiropoulos, On Behalf Of The Hadstruc Collaboration
Physics Faculty Publications
The nonsinglet helicity quark parton distribution functions (PDFs) of the nucleon are determined from lattice QCD, by jointly leveraging pseudodistributions and the distillation spatial smearing paradigm. A Lorentz decomposition of appropriately isolated spacelike matrix elements reveals pseudodistributions that contain information on the leadingtwist helicity PDFs, as well as an invariant amplitude that induces an additional z^{2} contamination of the leadingtwist signal. An analysis of the shortdistance behavior of the spacelike matrix elements using matching coefficients computed to nexttoleading order (NLO) exposes the desired PDF up to this additional z^{2} contamination. Due to the nonconservation of the axial current, …
Machine LearningBased Jet And Event Classification At The ElectronIon Collider With Applications To Hadron Structure And Spin Physics, Kyle Lee, James Mulligan, Mateusz Płoskoń, Felix Ringer, Feng Yuan
Machine LearningBased Jet And Event Classification At The ElectronIon Collider With Applications To Hadron Structure And Spin Physics, Kyle Lee, James Mulligan, Mateusz Płoskoń, Felix Ringer, Feng Yuan
Physics Faculty Publications
We explore machine learningbased jet and event identification at the future ElectronIon Collider (EIC). We study the effectiveness of machine learningbased classifiers at relatively low EIC energies, focusing on (i) identifying the flavor of the jet and (ii) identifying the underlying hard process of the event. We propose applications of our machine learningbased jet identification in the key research areas at the future EIC and current Relativistic Heavy Ion Collider program, including enhancing constraints on (transverse momentum dependent) parton distribution functions, improving experimental access to transverse spin asymmetries, studying photon structure, and quantifying the modification of hadrons and jets in …
Measurement Of SpinDensity Matrix Elements In P(770) Production With A Linearly Polarized Photon Beam At E𝛾 = 8.28.8 Gev, S. Adhikari, F. Afzal, C. S. Akondi, M. Albrecht, M. Amaryan, V. Arroyave, A. Asaturyan, A. Austregesilo, Z. Baldwin, F. Barbosa, J. Barlow, E. Barriga, R. Barsotti, T. D. Beattie, V. V. Berdnikov, T. Black, W. Boeglin, W. J. Briscoe, T. Britton, B. Zihlmann, Et Al., Gluex Collaboration
Measurement Of SpinDensity Matrix Elements In P(770) Production With A Linearly Polarized Photon Beam At E𝛾 = 8.28.8 Gev, S. Adhikari, F. Afzal, C. S. Akondi, M. Albrecht, M. Amaryan, V. Arroyave, A. Asaturyan, A. Austregesilo, Z. Baldwin, F. Barbosa, J. Barlow, E. Barriga, R. Barsotti, T. D. Beattie, V. V. Berdnikov, T. Black, W. Boeglin, W. J. Briscoe, T. Britton, B. Zihlmann, Et Al., Gluex Collaboration
Physics Faculty Publications
The GlueX experiment at Jefferson Lab studies photoproduction of mesons using linearly polarized 8.5 GeV photons impinging on a hydrogen target which is contained within a detector with nearcomplete coverage for charged and neutral particles. We present measurements of spindensity matrix elements for the photoproduction of the vector meson ρ(770). The statistical precision achieved exceeds that of previous experiments for polarized photoproduction in this energy range by orders of magnitude. We confirm a high degree of schannel helicity conservation at small squared fourmomentum transfer t and are able to extract the t dependence of natural and unnaturalparity exchange contributions to …
Observation Of Correlations Between Spin And Transverse Momenta In BackToBack Dihadron Production At Clas12, H. Avakian, T.B. Hayward, A. Kotzinian, W.R. Armstrong, H. Atac, C. Ayerbe Gayoso, L. Baashen, N.A. Balzell, L. Barion, M. Bashkanov, M. Battaglieri, I. Bedlinskiy, B. Benkel, F. Benmokhtar, A. Bianconi, L. Biondo, A. S. Biselli, M. Bondi, S. Boiarinov, M. Zurek, Et Al.
Observation Of Correlations Between Spin And Transverse Momenta In BackToBack Dihadron Production At Clas12, H. Avakian, T.B. Hayward, A. Kotzinian, W.R. Armstrong, H. Atac, C. Ayerbe Gayoso, L. Baashen, N.A. Balzell, L. Barion, M. Bashkanov, M. Battaglieri, I. Bedlinskiy, B. Benkel, F. Benmokhtar, A. Bianconi, L. Biondo, A. S. Biselli, M. Bondi, S. Boiarinov, M. Zurek, Et Al.
Physics Faculty Publications
We report the first measurements of deep inelastic scattering spindependent azimuthal asymmetries in backtoback dihadron electroproduction in the deep inelastic scattering process. In this reaction, two hadrons are produced in opposite hemispheres along the z axis in the virtual photontarget nucleon centerofmass frame, with the first hadron produced in the currentfragmentation region and the second in the targetfragmentation region. The data were taken with longitudinally polarized electron beams of 10.2 and 10.6 GeV incident on an unpolarized liquidhydrogen target using the CLAS12 spectrometer at Jefferson Lab. Observed nonzero sinΔϕ modulations in ep→e'pπ^{+} X events, where Δϕ is the difference …
Surface Properties And Rf Performance Of Vapor Diffused Nb₃Sn On Nb After Sequential Anneals Below 1000 °C, Jayendrika K. Tiskumara, Jean R. Delayen, U. Pudasaini, G. Eremeev
Surface Properties And Rf Performance Of Vapor Diffused Nb₃Sn On Nb After Sequential Anneals Below 1000 °C, Jayendrika K. Tiskumara, Jean R. Delayen, U. Pudasaini, G. Eremeev
Physics Faculty Publications
Nb₃Sn is a nextgeneration superconducting material that can be used for future superconducting radiofrequency (SRF) accelerator cavities, promising better performance, cost reduction, and higher operating temperature than Nb. The Sn vapor diffusion method is currently the most preferred and successful technique to coat niobium cavities with Nb₃Sn. Among postcoating treatments to optimize the coating quality, higher temperature annealing without Sn is known to degrade Nb₃Sn because of Sn loss. We have investigated Nb₃Sn/Nb samples briefly annealed at 8001000 °C, for 10 and 20 minutes to potentially improve the surface to enhance the performance of Nb₃Sncoated cavities. Following the sample studies, …
Full Treatment Of The Thrust Distribution In Single Inclusive E⁺E⁻ → H X Processes, M. Boglione, Andrea Simonelli
Full Treatment Of The Thrust Distribution In Single Inclusive E⁺E⁻ → H X Processes, M. Boglione, Andrea Simonelli
Physics Faculty Publications
Extending the transverse momentum dependent factorization to thrust dependent observables entails a series of difficulties, ultimately associated to the behavior of soft radiation. As a consequence, the definition of the transverse momentum dependent functions has to be revised, while preserving (and possibly extending) their universality properties. Moreover, the regularization of the rapidity divergences generates non trivial correlations between rapidity and thrust. In this paper, we show how to deal with these correlations in a consistent treatment of the thrust dependence of e^{+}e^{−} → h X cross section, where the hadron transverse momentum is measured with respect to …
Tuning Microwave Losses In Superconducting Resonators, Alex Gurevich
Tuning Microwave Losses In Superconducting Resonators, Alex Gurevich
Physics Faculty Publications
Performance of superconducting resonators, particularly cavities for particle accelerators and micro cavities and thin film resonators for quantum computations and photon detectors has been improved substantially by recent materials treatments and technological advances. As a result, the niobium cavities have reached the quality factors Q ~ 10^{11} at 12 GHz and 1.5 K and the breakdown radiofrequency (rf) fields H close to the dc superheating eld of the Meissner state. These advances raise the question whether the stateoftheart cavities are close to the fundamental limits, what these limits actually are, and to what extent the Q and H limits …
NeutrinoTagged Jets At The Electron Ion Collider, Miguel Arratia, ZhongBo Kang, Sebouh J. Paul, Alexei Prokudin, Felix Ringer, Fanyi Zhao
NeutrinoTagged Jets At The Electron Ion Collider, Miguel Arratia, ZhongBo Kang, Sebouh J. Paul, Alexei Prokudin, Felix Ringer, Fanyi Zhao
Physics Faculty Publications
We explore the potential of jet observables in chargedcurrent deep inelastic scattering events at the future ElectronIon Collider. Tagging jets with a recoiling neutrino, which can be identified by the event’s missing transverse momentum, will allow for flavorsensitive measurements of transverse momentum dependent parton distribution functions. We present the first predictions for transversespin asymmetries in azimuthal neutrinojet correlations and hadroninjet measurements. We study the kinematic reach and the precision of these measurements and explore their feasibility using parametrized detector simulations. We conclude that jet production in chargedcurrent deep inelastic scattering, while challenging in terms of luminosity requirements, will complement the …
Analytic Continuation Of The Relativistic ThreeParticle Scattering Amplitudes, Sebastian M. Dawid, Md Habib E. Islam, Raúl A. Briceño
Analytic Continuation Of The Relativistic ThreeParticle Scattering Amplitudes, Sebastian M. Dawid, Md Habib E. Islam, Raúl A. Briceño
Physics Faculty Publications
We investigate the relativistic scattering of three identical scalar bosons interacting via pairwise interactions. Extending techniques from the nonrelativistic threebody scattering theory, we provide a detailed and general prescription for solving and analytically continuing integral equations describing the threebody reactions. We use these techniques to study a system with zero angular momenta described by a single scattering length leading to a bound state in a twobody subchannel. We obtain boundstateparticle and threeparticle amplitudes in the previously unexplored kinematical regime; in particular, for real energies below elastic thresholds and complex energies in the physical and unphysical Riemann sheets. We extract positions …
MachineAssisted Discovery Of Integrable Symplectic Mappings, T. Zolkin, Y. Kharkov, S. Nagaitsev
MachineAssisted Discovery Of Integrable Symplectic Mappings, T. Zolkin, Y. Kharkov, S. Nagaitsev
Physics Faculty Publications
We present a new automated method for finding integrable symplectic maps of the plane. These dynamical systems possess a hidden symmetry associated with an existence of conserved quantities, i.e., integrals of motion. The core idea of the algorithm is based on the knowledge that the evolution of an integrable system in the phase space is restricted to a lowerdimensional submanifold. Limiting ourselves to polygon invariants of motion, we analyze the shape of individual trajectories thus successfully distinguishing integrable motion from chaotic cases. For example, our method rediscovers some of the famous McMillanSuris integrable mappings and ultradiscrete Painlevé equations. In total, …
Modeling A Nb_{3}Sn Cryounit In Gpt At Uitf, Sunil Pokharel, A. S. Hofler, Geoffrey A. Krafft
Modeling A Nb3Sn Cryounit In Gpt At Uitf, Sunil Pokharel, A. S. Hofler, Geoffrey A. Krafft
Physics Faculty Publications
Nb_{3}Sn is a prospective material for future superconducting radio frequency (SRF) accelerator cavities. Compared to conventional niobium, the material can achieve higher quality factors, higher temperature operation, and potentially higher accelerating gradients (E_{acc} ≈ 96 MV/m). In this work, we performed modeling of the Upgraded Injector Test Facility (UITF) at Jefferson Lab utilizing newly constructed Nb_{3}Sn cavities. We studied the effects of the buncher cavity and varied the gun voltage from 200500 keV. We have calibrated and optimized the SRF cavity gradients and phases for the Nb_{3}Sn fivecell cavities' energy gains with the …
Basics Of Factorization In A Scalar Yukawa Field Theory, F. Aslan, L. Gamberg, J.O. GonzalezHernandez, T. Rainaldi, T. C. Rogers
Basics Of Factorization In A Scalar Yukawa Field Theory, F. Aslan, L. Gamberg, J.O. GonzalezHernandez, T. Rainaldi, T. C. Rogers
Physics Faculty Publications
The factorization theorems of QCD apply equally well to most simple quantum field theories that require renormalization but where direct calculations are much more straightforward. Working with these simpler theories is convenient for stress testing the limits of the factorization program and for examining general properties of the parton density functions or other correlation functions that might be necessary for a factorized description of a process. With this view in mind, we review the steps of factorization in a real scalar Yukawa field theory for both deep inelastic scattering and semiinclusive deep inelastic scattering cross sections. In the case of …
Development Of A Prototype Superconducting RadioFrequency Cavity For Conduction Cooled Accelerators, Gianluigi Ciovati, J. Anderson, S. Balachandran, G. Cheng, B. Coritron, E. Daly, P. Dhakal, Alex Gurevich, F. Hannon, K. Harding, L. Holland, F. Marhauser, K. Mclaughlin, D. Packard, T. Powers, U. Pudasaini, J. Rathke, R. Rimmer, T. Schultheiss, H. Vennekate, D. Vollmer
Development Of A Prototype Superconducting RadioFrequency Cavity For Conduction Cooled Accelerators, Gianluigi Ciovati, J. Anderson, S. Balachandran, G. Cheng, B. Coritron, E. Daly, P. Dhakal, Alex Gurevich, F. Hannon, K. Harding, L. Holland, F. Marhauser, K. Mclaughlin, D. Packard, T. Powers, U. Pudasaini, J. Rathke, R. Rimmer, T. Schultheiss, H. Vennekate, D. Vollmer
Physics Faculty Publications
The higher efficiency of superconducting radiofrequency (SRF) cavities compared to normal conducting ones enables the development of highenergy continuouswave linear accelerators (linacs). Recent progress in the development of highquality Nb_{3}Sn film coatings along with the availability of cryocoolers with high cooling capacity at 4 K makes it feasible to operate SRF cavities cooled by thermal conduction at relevant accelerating gradients for use in accelerators. A possible use of conductioncooled SRF linacs is for environmental applications, requiring electron beams with energy of 110 MeV and 1 MW of power. We have designed a 915 MHz SRF linac for such …
Resolution To The Problem Of Consistent Large Transverse Momentum In Tmds, J. O. GonzalezHernandez, Tommaso Rainaldi, Ted Rogers
Resolution To The Problem Of Consistent Large Transverse Momentum In Tmds, J. O. GonzalezHernandez, Tommaso Rainaldi, Ted Rogers
Physics Faculty Publications
Parametrizing TMD parton densities and fragmentation functions in ways that consistently match their large transversemomentum behavior in standard collinear factorization has remained notoriously difficult. We show how the problem is solved in a recently introduced set of steps for combining perturbative and nonperturbative transverse momentum in TMD factorization. Called a “bottomup” approach in a previous article, here we call it a “hadron structure oriented” (HSO) approach to emphasize its focus on preserving a connection to the TMD parton model interpretation. We show that the associated consistency constraints improve considerably the agreement between parametrizations of TMD functions and their largekT behavior, …
First Clas12 Measurement Of Deeply Virtual Compton Scattering BeamSpin Asymmetries In The Extended Valence Region, G. Christiaens, M. Defurne, D. Sokhan, P. Achenbach, Z. Akbar, M. J. Amaryan, H. Atac, H. Avakian, C. Ayerbe Gayoso, L. Baashen, N. A. Baltzell, L. Barion, M. Bashkanov, M. Battaglieri, I. Bedlinskiy, B. Benkel, F. Benmokhtar, A. Bianconi, A. S. Biselli, M. Zurek, Et Al., Clas Collaboration
First Clas12 Measurement Of Deeply Virtual Compton Scattering BeamSpin Asymmetries In The Extended Valence Region, G. Christiaens, M. Defurne, D. Sokhan, P. Achenbach, Z. Akbar, M. J. Amaryan, H. Atac, H. Avakian, C. Ayerbe Gayoso, L. Baashen, N. A. Baltzell, L. Barion, M. Bashkanov, M. Battaglieri, I. Bedlinskiy, B. Benkel, F. Benmokhtar, A. Bianconi, A. S. Biselli, M. Zurek, Et Al., Clas Collaboration
Physics Faculty Publications
Deeply virtual Compton scattering (DVCS) allows one to probe generalized parton distributions describing the 3D structure of the nucleon. We report the first measurement of the DVCS beamspin asymmetry using the CLAS12 spectrometer with a 10.2 and 10.6 GeV electron beam scattering from unpolarized protons. The results greatly extend the Q^{2} and Bjorkenx phase space beyond the existing data in the valence region and provide 1600 new data points measured with unprecedented statistical uncertainty, setting new, tight constraints for future phenomenological studies.
Observation Of Large MissingMomentum (E, E' P) CrossSection Scaling And The Onset Of CorrelatedPair Dominance In Nuclei, I. Korover, A. W. Denniston, A. Kiral, A. Schmidt, A. Lovato, N. Rocco, A. Nikolakopoulos, L. B. Weinstein, E. Piasetzky, O. Hen, M. J. Amaryan, Giovanni Angelini, H. Atac, N. A. Baltzell, L. Barion, M. Battaglieri, I. Bedlinskiy, Fatiha Benmokhtar, A. Bianconi, Z. W. Zhao, Et Al., Clas Collaboration
Observation Of Large MissingMomentum (E, E' P) CrossSection Scaling And The Onset Of CorrelatedPair Dominance In Nuclei, I. Korover, A. W. Denniston, A. Kiral, A. Schmidt, A. Lovato, N. Rocco, A. Nikolakopoulos, L. B. Weinstein, E. Piasetzky, O. Hen, M. J. Amaryan, Giovanni Angelini, H. Atac, N. A. Baltzell, L. Barion, M. Battaglieri, I. Bedlinskiy, Fatiha Benmokhtar, A. Bianconi, Z. W. Zhao, Et Al., Clas Collaboration
Physics Faculty Publications
We report the measurement of 𝒙_{B} scaling in (e,e′p) crosssection ratios off nuclei relative to deuterium at large missing momentum of 350 ≤ _{Pmiss} ≤ 600 MeV/c. The observed scaling extends over a kinematic range of 0.7 ≤ 𝒙_{B} ≤ 1.8, which is significantly wider than 1.4 ≤ 𝒙_{B }≤ 1.8 previously observed for inclusive (e,e′) crosssection ratios. The 𝒙_{B}integrated crosssection ratios become constant (i.e., scale) beginning at p_{miss} ≈ kF, the nuclear Fermi momentum. Comparing with theoretical calculations we find good agreement with generalized contact formalism calculations for high missing …
Searching For Prompt And LongLived Dark Photons In Electroproduced E⁺ E⁻ Pairs With The Heavy Photon Search Experiment At Jlab, P. H. Adrian, N. A. Baltzell, M. Battaglieri, M. Bondí, S. Boyarinov, S. Bueltmann, P. Butti, V. D. Burkert, D. Calvo, T. Cao, M. Carpinelli, A. Celentano, G. Charles, L. Colaneri, W. Cooper, D. Crowe, C. Cuevas, A. D'Angelo, N. Dashyan, B. Wojtsekhowski, Et Al.
Searching For Prompt And LongLived Dark Photons In Electroproduced E⁺ E⁻ Pairs With The Heavy Photon Search Experiment At Jlab, P. H. Adrian, N. A. Baltzell, M. Battaglieri, M. Bondí, S. Boyarinov, S. Bueltmann, P. Butti, V. D. Burkert, D. Calvo, T. Cao, M. Carpinelli, A. Celentano, G. Charles, L. Colaneri, W. Cooper, D. Crowe, C. Cuevas, A. D'Angelo, N. Dashyan, B. Wojtsekhowski, Et Al.
Physics Faculty Publications
The heavy photon search experiment (HPS) at the Thomas Jefferson National Accelerator Facility searches for electroproduced dark photons. We report results from the 2016 engineering run consisting of 10 608 nb^{−1} of data for both the prompt and displaced vertex searches. A search for a prompt resonance in the e^{+}e^{− }invariant mass distribution between 39 and 179 MeV showed no evidence of dark photons above the large QED background, limiting the coupling of ε^{2}≳10^{−5}, in agreement with previous searches. The search for displaced vertices showed no evidence of excess signal over background …
Investigation Of The Multilayer Shielding Effect Through NbtinAin Coated Bulk Niobium, Iresha Harshani Senevirathne, D. R. Beverstock, AM ValenteFeliciano, Alex Gurevich, Jean R. Delayen
Investigation Of The Multilayer Shielding Effect Through NbtinAin Coated Bulk Niobium, Iresha Harshani Senevirathne, D. R. Beverstock, AM ValenteFeliciano, Alex Gurevich, Jean R. Delayen
Physics Faculty Publications
We report measurements of the dc field onset B_{p} of magnetic flux penetration through NbTiNAlN coating on bulk niobium using the Hall probe experimental setup. The measurements of B_{p} reveal the multilayer shielding effect on bulk niobium under high magnetic fields at cryogenic temperatures. We observed a significant enhancement in B_{p} for the NbTiNAlN coated Nb samples as compared to bare Nb samples. The observed dependence of B_{p} on the coating thickness is consistent with theoretical predictions.
Eic 197 Mhz Crab Cavity Rf Optimization, Zenghai Li, Subashini U. De Silva, Jean R. Delayen, Robert A. Rimmer, Qiong Wu, Binping Xiao, Wencan Xu
Eic 197 Mhz Crab Cavity Rf Optimization, Zenghai Li, Subashini U. De Silva, Jean R. Delayen, Robert A. Rimmer, Qiong Wu, Binping Xiao, Wencan Xu
Physics Faculty Publications
Crab cavities, operating at 197 MHz and 394 MHz respectively, will be used to compensate the loss of luminosity due to a 25 mrad crossing angle at the interaction point in the Electron Ion Collider (EIC). Both crab cavities are of the RF Dipole (RFD) shape. To meet the machine design requirements, there are a few important cavity design considerations that need to be addressed. First, to achieve stable cavity operation at the design voltages, cavity geometry details must be optimized to suppress potential multipacting. Incorporating strong HOM damping in the cavity design is required for the beam stability and …
Temperature, Rf Field, And Frequency Dependence Performance Evaluation Of Superconducting Niobium HalfWave Coaxial Cavity, N. K. Raut, G. Ciovati, S. U. De Silva, J. R. Delayen, P. Dhakal, B. D. Khanal, J. K. Tiskumara
Temperature, Rf Field, And Frequency Dependence Performance Evaluation Of Superconducting Niobium HalfWave Coaxial Cavity, N. K. Raut, G. Ciovati, S. U. De Silva, J. R. Delayen, P. Dhakal, B. D. Khanal, J. K. Tiskumara
Physics Faculty Publications
Recent advancement in superconducting radio frequency cavity processing techniques, with diffusion of impurities within the RF penetration depth, resulted in high quality factor with increase in quality factor with increasing accelerating gradient. The increase in quality factor is the result of a decrease in the surface resistance as a result of nonmagnetic impurities doping and change in electronic density of states. The fundamental understanding of the dependence of surface resistance on frequency and surface preparation is still an active area of research. Here, we present the result of RF measurements of the TEM modes in a coaxial halfwave niobium cavity …
Concept Connectivity: An Educational And Research Framework For Scientific Learning In Optics, Photonics, And Electronic Education, Benjamin Dingel, John Gabriel C. Rivera, Francesca De Guzman Palabrica, Clint Dominic Bennett
Concept Connectivity: An Educational And Research Framework For Scientific Learning In Optics, Photonics, And Electronic Education, Benjamin Dingel, John Gabriel C. Rivera, Francesca De Guzman Palabrica, Clint Dominic Bennett
Physics Faculty Publications
We present a novel framework referred to as Concept Connectivity that aids in educating and engaging students by presenting the topic of the Special Theory of Relativity (STR) in a coherent and unified manner. It uses different analogue implementations of the STR coming from seemingly distinct fields of study such as (i) Optics, (ii) Photonics, and (iii) Electronics to connect not only to the concepts of the STR but to the various concepts from these different fields. In these analogue implementations, the fundamental characteristics of the different STR phenomena can be mimicked in many different ways. Concept Connectivity has two …
Microstructural Characterizations And Strength Development Of SelfCompacting Concrete Using Rice Husk Ash, Floyd Rey P. Plando, Joel T. Maquiling
Microstructural Characterizations And Strength Development Of SelfCompacting Concrete Using Rice Husk Ash, Floyd Rey P. Plando, Joel T. Maquiling
Physics Faculty Publications
The conversion of waste and byproducts into green building materials is gaining attention for a sustainable economy. Particularly, rice husk ash (RHA) is used as a precursor in selfcompacting concrete due to its high pozzolanic activity. It also minimizes the use of conventional OPC as a primary binder during construction by exploiting its chemical features and characteristics as an alternative binding agent. Developing and massproducing RHA as a cementitious material would lessen the carbon footprint that harms the environment. This study presents the compressive strength and microstructural characterizations of rice husk ashbased selfcompacting concrete (RHASCC). The scanning electron microscope was …
The PostShock Nonequilibrium Relaxation In A Hypersonic Plasma Flow Involving Reflection Off A Thermal Discontinuity, Anna Markhotok
The PostShock Nonequilibrium Relaxation In A Hypersonic Plasma Flow Involving Reflection Off A Thermal Discontinuity, Anna Markhotok
Physics Faculty Publications
The evolution in the post shock nonequilibrium relaxation in a hypersonic plasma flow was investigated during a shock’s reflection off a thermal discontinuity. Within a transitional period, the relaxation zone parameters past both, the reflected and transmitted waves, evolve differently compared to that in the incident wave. In a numerical example for the nondissociating N_{2} gas heated to 5000 K/10,000 K across the interface and M = 3.5, the relaxation time for the transmitted wave is up to 50% shorter and the relaxation depth for both waves is significantly reduced, thus resulting in a weakened wave structure. The …
Gluon TransverseMomentumDependent Distributions From LargeMomentum Effective Theory, Ruilin Zhu, Yao Ji, JianHui Zhang, Shuai Zhao
Gluon TransverseMomentumDependent Distributions From LargeMomentum Effective Theory, Ruilin Zhu, Yao Ji, JianHui Zhang, Shuai Zhao
Physics Faculty Publications
We demonstrate that gluon transversemomentumdependent parton distribution functions (TMDPDFs) can be extracted from lattice calculations of appropriate Euclidean correlations in largemomentum effective theory (LaMET). Based on perturbative calculations of gluon unpolarized and helicity TMDPDFs, we present a matching formula connecting them and their LaMET counterparts, where the latter are renormalized in a scheme facilitating lattice calculations and converted to the MS ¯ scheme. The hard matching kernel is given up to oneloop level. We also show that the perturbative result is independent of the prescription used for the pinchpole singularity in the relevant correlations. Our results offer a guidance for …
Prospects For 𝛾*𝛾* → 𝜋𝜋 Via Lattice Qcd, Raúl Briceño, Andrew W. Jackura, Arkaitz Rodas, Juan V. Guerrero
Prospects For 𝛾*𝛾* → 𝜋𝜋 Via Lattice Qcd, Raúl Briceño, Andrew W. Jackura, Arkaitz Rodas, Juan V. Guerrero
Physics Faculty Publications
The 𝛾*𝛾* → 𝜋𝜋 scattering amplitude plays a key role in a wide range of phenomena, including understanding the inner structure of scalar resonances as well as constraining the hadronic contributions to the anomalous magnetic moment of the muon. In this work, we explain how the infinitevolume Minkowski amplitude can be constrained from finitevolume Euclidean correlation functions. The relationship between the finitevolume Euclidean correlation functions and the desired amplitude holds up to energies where 3𝜋 states can go on shell, and is exact up to exponentially small corrections that scale like 𝒪(e^{−m𝜋L}), where L is the spatial extent …
A Multidimensional Study Of The Structure Function Ratio Σlt'/ Σ₀ From Hard Exclusive ��⁺ ElectroProduction Off Protons In The Gpd Regime, S. Diehl, A. Kim, K. Joo, P. Achenbach, Z. Akbar, M. J. Amaryan, H. Atac, H. Avagyan, C. Ayerbe Gayoso, L. Baashen, L. Barion, M. Bashkanov, M. Battaglieri, I. Bedlinsky, B. Benkel, F. Benmokhtar, A. Bianconi, A. S. Biselli, M. Bondi, W.A. Booth, M. Zurek, Et Al.
A Multidimensional Study Of The Structure Function Ratio Σlt'/ Σ₀ From Hard Exclusive ��⁺ ElectroProduction Off Protons In The Gpd Regime, S. Diehl, A. Kim, K. Joo, P. Achenbach, Z. Akbar, M. J. Amaryan, H. Atac, H. Avagyan, C. Ayerbe Gayoso, L. Baashen, L. Barion, M. Bashkanov, M. Battaglieri, I. Bedlinsky, B. Benkel, F. Benmokhtar, A. Bianconi, A. S. Biselli, M. Bondi, W.A. Booth, M. Zurek, Et Al.
Physics Faculty Publications
A multidimensional extraction of the structure function ratio from the hard exclusive ^{→}ep → e'n��+ reaction above the resonance region has been performed. The study was done based on beamspin asymmetry measurements using a 10.6 GeV incident electron beam on a liquidhydrogen target and the CLAS12 spectrometer at Jefferson Lab. The measurements focus on the very forward regime (t/Q^{2}≪ 1) with a wide kinematic range of in the valence regime (0.17 < ��_{B }< 0.55), and virtualities ranging from 1.5 GeV^{2} up to 6 GeV^{2}. The results and their comparison to theoretical models based on Generalized Parton Distributions demonstrate the sensitivity to chiralodd …